B001B
DTC B001A or B001B
Diagnostic Instructions
- Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure Initial Inspection and Diagnostic Overview.
- Review Strategy Based Diagnosis for an overview of the diagnostic approach Initial Inspection and Diagnostic Overview.
- Diagnostic Procedure Instructions provide an overview of each diagnostic category Initial Inspection and Diagnostic Overview.
DTC Descriptors
DTC B001A 01: Driver Seat Belt Anchor Pretensioner Deployment Loop Short to Battery
DTC B001A 02: Driver Seat Belt Anchor Pretensioner Deployment Loop Short to Ground
DTC B001A 04: Driver Seat Belt Anchor Pretensioner Deployment Loop Open
DTC B001A 0D: Driver Seat Belt Anchor Pretensioner Deployment Loop High Resistance
DTC B001A 0E: Driver Seat Belt Anchor Pretensioner Deployment Loop Low Resistance
DTC B001B 01: Passenger Seat Belt Anchor Pretensioner Deployment Loop Short to Battery
DTC B001B 02: Passenger Seat Belt Anchor Pretensioner Deployment Loop Short to Ground
DTC B001B 04: Passenger Seat Belt Anchor Pretensioner Deployment Loop Open
DTC B001B 0D: Passenger Seat Belt Anchor Pretensioner Deployment Loop High Resistance
DTC B001B 0E: Passenger Seat Belt Anchor Pretensioner Deployment Loop Low Resistance
Diagnostic Fault Information
Circuit/System Description
During a side or frontal crash of sufficient force the Inflatable Restraint Sensing and Diagnostic Module (SDM) will allow current to flow through the deployment loop in order to deploy the appropriate seat belt anchor pretensioner. The Inflatable Restraint Sensing and Diagnostic Module performs continuous diagnostic tests on the deployment loops to check for proper circuit continuity and for shorts to ground or voltage.
A shorting bar used within the seat belt anchor pretensioner connector will short together both seat belt anchor pretensioner high and low control circuits when the connector is disconnected, this will help to prevent unwanted deployment of the pretensioner during servicing.
Conditions for Running the DTC
Ignition voltage is between 9-16 V.
Conditions for Setting the DTC
B001A 01, B001B 01
The seat belt anchor pretensioner control circuit is shorted to voltage for 120 milliseconds.
B001A 02, B001B 02
The seat belt anchor pretensioner control circuit is shorted to ground for 120 milliseconds.
B001A 04, B001B 04
The seat belt anchor pretensioner control circuit is open for 120 milliseconds.
B001A 0D, B001B 0D
The seat belt anchor pretensioner deployment loop resistance is more than 4.2 ohms for 120 milliseconds.
B001A 0E, B001B 0E
The seat belt anchor pretensioner deployment loop resistance is less than 1.7 ohms for 120 milliseconds.
Action Taken When the DTC Sets
- The Inflatable Restraint Sensing and Diagnostic Module requests the instrument cluster to illuminate the AIR BAG indicator.
- The Inflatable Restraint Sensing and Diagnostic Module will store a DTC, however if an event occurs the system will still attempt deployments.
Conditions for Clearing the DTC
- The condition for setting the DTC no longer exists.
- A history DTC will clear once 100 malfunction-free ignition cycles have occurred.
Diagnostic Aid
Note: The following diagnostic aids apply for both current and history DTCs.
An incorrectly installed CPA or incorrectly seated connector can cause a shorting bar to short both control circuits together. Check the connectors and CPAs if a DTC with symptom byte 02 or 0E is set, to ensure that the shorting bars are not causing the circuits to be shorted together. Shorting bars locations are listed below:
- Inline connectors - on the seat belt anchor pretensioner side of the harness connector
- Harness side of the Inflatable Restraint Sensing and Diagnostic Module connector
Terminal fretting, an incorrectly installed CPA, or incorrectly seated connector can cause an open/high resistance condition. Check the circuit terminals for fretting, incorrectly installed CPAs, or incorrectly seated connectors if a DTC with symptom byte 04 or 0D is set.
If the seat belt anchor pretensionser has deployed under unexpected conditions and/or DTC with symptom byte 01 is set, check both control circuits for a short to voltage.
Reference Information
Schematic Reference
SIR Schematics Electrical Diagrams
Connector End View Reference
Component Connector End Views Connector Views
Description and Operation
SIR System Description and Operation Description and Operation
Electrical Information Reference
- Circuit Testing General Electrical Diagnostic Procedures
- Connector Repairs General Electrical Diagnostic Procedures
- Testing for Intermittent Conditions and Poor Connections General Electrical Diagnostic Procedures
- Wiring Repairs General Electrical Diagnostic Procedures
Scan Tool Reference
Control Module References for scan tool information Control Module References
Special Tools
J 38715-A Driver and Passenger SIR Load Tool
Circuit/System Testing
Refer to SIR Service Precautions Service Precautions.
Note: Inspect all terminals for damage or corrosion when disconnecting connectors. Damage or corrosion in the following requires repair or replacement of the affected component/connector.
- Seat belt anchor pretensioner
- Inflatable Restraint Sensing and Diagnostic Module
- Seat belt anchor pretensioner wiring harness connector
- Inflatable Restraint Sensing and Diagnostic Module wiring harness connector
Note: The connector and connector position assurance (CPA) may seat independent of each other. Both the connector and CPA should seat with an audible and/or tactile click. The CPA isolates the shorting-bars within the connector allowing the deployment circuit to operate properly. Replace any CPA that is damaged or missing.
If the condition is intermittent or cannot be duplicated, disconnect the connectors and add dielectric grease / lubricant (Nyogel 760G or equivalent, meeting GM specification 9986087). This procedure will correct the high resistance condition due to terminal fretting corrosion.
1. Verify that the appropriate driver steering wheel air bag connector and the CPA are engaged.
-> If the above condition is not found, make the appropriate repair.
2. Ignition OFF, disconnect the harness connector at the appropriate seat belt anchor pretensioner.
3. With the appropriate load tool adaptor, connect special tool J 38715-A Driver and Passenger SIR Load Tool or SA9409Z-A SIR Load Tool (Driver/Passenger/Curtain) in place of the appropriate seat belt anchor pretensioner.
4. Ignition ON, verify DTC is set as current.
-> If the DTC is not set or is set as history, cycle ignition OFF, disconnect the load tool and adaptor, reconnect the harness connector at the seat belt anchor pretensioner, and cycle the ignition ON. If the DTC resets after reconnecting the module, replace the appropriate seat belt anchor pretensioner.
5. Ignition OFF, disconnect the load tool and adaptor.
6. Wait for 120 seconds and then test for greater than 25 ohms between the seat belt anchor pretensioner control circuits terminal 1 and terminal 2.
-> If less than the specified range, test for a short between the control circuits, check each connector and CPA to ensure that the shorting bars are lifted. If the circuits and shorting bars tests normal, replace the Inflatable Restraint Sensing and Diagnostic Module.
7. Ignition ON, test for less than 11 V between each of the seat belt anchor pretensioner control circuit terminals 1 and 2 and ground.
-> If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the Inflatable Restraint Sensing and Diagnostic Module.
8. Ignition OFF, test for greater than 25 ohms between each of the seat belt anchor pretensioner control circuit terminals 1 and 2 and ground.
-> If less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the Inflatable Restraint Sensing and Diagnostic Module.
9. Disconnect the harness connector at the Inflatable Restraint Sensing and Diagnostic Module.
10. Test for less then 1 ohm between the appropriate control circuit terminals listed below:
- Seat Belt Anchor Pretensioner - Driver control circuit terminal 1 and Inflatable Restraint Sensing and Diagnostic Module terminal 25
- Seat Belt Anchor Pretensioner - Driver control circuit terminal 2 and Inflatable Restraint Sensing and Diagnostic Module terminal 24
- Seat Belt Anchor Pretensioner - Passenger control circuit terminal 1 and Inflatable Restraint Sensing and Diagnostic Module terminal 26
- Seat Belt Anchor Pretensioner - Passenger control circuit terminal 2 and Inflatable Restraint Sensing and Diagnostic Module terminal 27
-> If not the specified range, test the high control circuit for an open/high resistance.
11. If all circuits test normal, replace the Inflatable Restraint Sensing and Diagnostic Module.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Front Seat Belt Anchor Plate Tensioner Replacement Service and Repair
- SIR/SRS Wiring Repairs General Electrical Diagnostic Procedures
- Control Module References for Inflatable Restraint Sensing and Diagnostic Module replacement, programming and setup Control Module References